Need help building a regex that matches a string only if it has the format of between 1 and 5 percent signs (%) optionally delimited by a colon(:)?

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悲哀的现实
悲哀的现实 2020-11-22 02:50

I\'ve been struggling with this for a couple hours now, so I\'m hoping someone can help me out or point me in the right direction. The string must start and end with at leas

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